Technical information
Behaviour being used: Adaptive mode
Minimum fraction: 0
Question summary: Solve the problem. The polynomial function I(t) = -.1t2 + 1.5t represents the yearly income (or loss) from a real estate investment, where t is time in years. After how many years does income begin to decline? Round to the nearest tenth of a year, if necessary.: 15 years; 10 years; 6.5 years; 7.5 years
Right answer summary: 7.5 years
Question state: todo